BS A 346-2000 (ISO 3161-1999)

BRITISH STANDARD AEROSPACE SERIES

I S B ) c ( , y p o C d e l l o r t n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 3 3 : 1 1 : 3 1 5 0 r a M n o M , a n , r e s U B U A : y p o C d e s n e c i L

UNJ threads Ð General requirements and limit dimensions

ICS 49.030.10

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

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BS A 346:20 346:2000 00 ISO 3161:1999

BS A 346:2000

National foreword This British Standard reproduces verbatim ISO 3161:1999 and implements it as the UK national standard. It supersedes BS 4084:1996 which is withdrawn.

I S B ) c ( , y p o C d e l l o r t n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 3 3 : 1 1 : 3 1 5 0 r a M n o M , a n , r e s U B U A : y p o C d e This British Standard, having s been prepared under the n e direction of the Engineering c Sector Committee, was published i L under the authority of the Standards Committee and comes into effect on 15 January 2000

©

BSI 01-2000

ISBN 0 580 34016 3

The UK participation in its preparation was entrusted by Technical Committee ACE/12, ACE/12, Aerospac Aerospace e fasteners fasteners and fastenin fastening g systems systems,, to Subcommitte Subcommittee e ACE/12/1, ACE/12/1, Aerospa Aerospace ce fasteners fasteners and fastening fastening systems systems (Internatio (International) nal),, which which has the responsibility to: Ð aid enquirers enquirers to understa understand nd the text; text; Ð present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; Ð monitor related international and European developments and promulgate them in the UK. A list of organiza organizations tions represen represented ted on this subcommi subcommittee ttee can be obtained obtained on request request to its secretary. Cross-references

The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue. A British Standard Standard does not purport purport to include include all the necessary necessary provisions provisions of a contract. Users of British Standards are responsible for their correct application. Complian Compliance ce wit h a British British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, the ISO title page, pages pages ii and iii, a blank blank page, pages 1 to 40, an inside back cover and a back cover. cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendmen Amen dments ts issued since publicat ion

Amd. Amd. No.

Date

Comment Commentss

BS A 346:2000

National foreword This British Standard reproduces verbatim ISO 3161:1999 and implements it as the UK national standard. It supersedes BS 4084:1996 which is withdrawn.

I S B ) c ( , y p o C d e l l o r t n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 3 3 : 1 1 : 3 1 5 0 r a M n o M , a n , r e s U B U A : y p o C d e This British Standard, having s been prepared under the n e direction of the Engineering c Sector Committee, was published i L under the authority of the Standards Committee and comes into effect on 15 January 2000

©

BSI 01-2000

ISBN 0 580 34016 3

The UK participation in its preparation was entrusted by Technical Committee ACE/12, ACE/12, Aerospac Aerospace e fasteners fasteners and fastenin fastening g systems systems,, to Subcommitte Subcommittee e ACE/12/1, ACE/12/1, Aerospa Aerospace ce fasteners fasteners and fastening fastening systems systems (Internatio (International) nal),, which which has the responsibility to: Ð aid enquirers enquirers to understa understand nd the text; text; Ð present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; Ð monitor related international and European developments and promulgate them in the UK. A list of organiza organizations tions represen represented ted on this subcommi subcommittee ttee can be obtained obtained on request request to its secretary. Cross-references

The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue. A British Standard Standard does not purport purport to include include all the necessary necessary provisions provisions of a contract. Users of British Standards are responsible for their correct application. Complian Compliance ce wit h a British British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, the ISO title page, pages pages ii and iii, a blank blank page, pages 1 to 40, an inside back cover and a back cover. cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendmen Amen dments ts issued since publicat ion

Amd. Amd. No.

Date

Comment Commentss

ISO 3161

INTERNATIONAL STANDARD

Third edition 1999-12-01


Aerospace — UNJ threads — General requirements and limit dimensions Aéronautique Aéronautique et espace — Filetage UNJ — Exigences générales générales et dimensions limites

Reference number ISO 3161:1999(E)


ISO 3161:1999(E)

Foreword I S B ) c ( , y p o C d e l l o r t n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 3 3 : 1 1 : 3 1 5 0 r a M n o M , a n , r e s U B U A : y p o C d e s n e c i L

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 3161 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles , Subcommittee SC 4, Aerospace fastener systems . This third edition cancels and replaces the second edition (ISO 3161:1996), which has been technically revised.


INTERNATIONAL STANDARD


ISO 3161:1999(E)

Aerospace — UNJ threads — General requirements and limit dimensions

1

Scope

This International Standard specifies the general requirements and limit dimensions of inch series UNJ threads with controlled root radius for aerospace construction. It determines the basic triangular profile for this type of thread and gives a system for designating the diameter and number of threads per inch combinations. For all diameters 0,060 in (1,524 mm) to 6,000 in (152,4 mm), it offers in the form of tables the basic dimensions and tolerances for a selection of diameter and number of threads per inch combinations. It also provides the method of calculation for the dimensions and tolerances for any diameter and number of threads per inch combination not given in the tables, including threads with a diameter in excess of 6,000 in.

2

Normative reference

The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 15872:—1, Aerospace — UNJ threads — Gauging.

3

Term and definition

For the purposes of this International Standard, the following term and definition apply. 3.1 basic profile in an axial plan, the theoretical profile corresponding to the basic dimensions See Figure 1.

4 4.1

Basic profile Symbols

See Figure 1.

1 To be published.

ISO 3161:1999(E)

4.2

Basic profile dimensions

See Figure 1 and Table 1. Values given in Table 1 have been calculated according to the following formulae: I 1 S P B n ) c ( 1 , n y P p o C 3 0,866 025 d H   P  0,866 025 P  e l n 2 l o r t 9 048714 , n 0,48714P H o c 16 n n U , 3 0,324 76 7 0,324 76 P H 0 8 n 0 2 0 5 0,270 63 0 0,270 63P H : 16 n 0 0 + H 0,108 25 T 0,108 25 P M n 8 G 3 3 : 4.3 Basic dimensions of thread 1 1 : 3Values given in Table 2 have been calculated according to the following formulae: 1 5 0 F 3 H I  D  0,649 519P  D  0,649 519 D2  D  G 2  r H 8 J K n a M n F 3 H I  d  0,649 519P  d  0,649 519 o d2  d  G 2  H 8 J K M n , a n F 9 H I  D  0,974 28P  D  0,974 28 , r D1  D  G 2  J e H K 16 n s U B F 9 H I  d  0,974 28P  d  0,974 28 d1  d  G 2  J U H K 16 n A : y pThe tolerances shall be applied to the basic profile. o C d e s n e c i L 



















ISO 3161:1999(E)


where D

is the basic major diameter of in ternal thread

D2

is the basic pitch diameter of internal thread

D1

is the basic minor diameter of internal thread

d

is the basic major diameter of external thread

d 2

is the basic pitch diameter of external thread

d 1

is the basic minor diameter of external thread

H

a

is the height of fundamental triangle

P

is the pitch

n

is the number of threads per inch

Axis of thread

Figure 1 — Basic profile

5 5.1

Series of threads General

This International Standard includes various series of threads, i.e. groups of diameter and number of threads per inch combinations distinguished from each other by the number of threads per inch associated with any given thread diameter. These series of threads are given in Table 3.

5.2

Diameters

Columns 1 and 2 of Table 3 give the primary and secondary series nominal sizes which satisfy current requirements.

ISO 3161:1999(E)

5.3 5.3.1

Number of threads per inch (n) General

Columns 3 to 9 (inclusive) of Table 3 give the numbers of threads per inch which are recommended to be associated with the diameters in columns 1 and 2. These columns of the numbers of threads per inch are divided I Sinto two groups: B ) c  series with increasing (progressive) pitches: columns 3, 4 and 5; ( , y p  constant (uniform) pitch series: columns 6, 7, 8 and 9. o C d5.3.2 Series with increasing (progressive) pitches e l l o r There are three series of increasing pitches. They are headed "Coarse pitch", "Fine pitch" and "Extra fine pitch" in t naccordance with current practice. o c n UThese terms indicate the relative pitches of the three series for each given thread diameter and do not imply a , 7difference in quality between the series. 0 0 2 5.3.3 Constant (uniform) pitch series 0 0 : 0In addition to these three series of increasing pitches, Table 3 includes details of constant pitch series which have 0 +been selected from the range of 8 threads per inch to 20 threads per inch. Each of these series is limited to an Tappropriate range of diameters. M G 35.4 Threads outside selection 3 : 1 1 : The threads specified in 5.3.2 and 5.3.3 and indicated in Table 3 meet most requirements. If other diameter and 3number of threads per inch combinations or threads larger than 6,000 in in diameter are required, then these shall 1 5be calculated using the formulae in 6.3.2. 0 r a M n6 Tolerances o M , 6.1 Length of thread engagement used for calculating the pitch diameter tolerances a n , The length of thread engagement ( L ) (see Figure 2) used in this International Standard is equal to r e e s U  the basic major diameter for the series UNJC, UNJF and 8 UNJ. This is applicable for actual lengths of B engagement between 1,0 D and 1,5 D; U A : y  9P for the series UNJEF, 12 UNJ, 16 UNJ, 20 UNJ and all UNJS. This is applicable for actual lengths of p engagement between 5P and 15P. o C dFor applications with lengths of engagement not within the above limits, the tolerances on the pitch diameter shall e s be calculated according to the calculation formulae for T and T , using the design length of engagement as L . d 2 D2 e n e c i L

ISO 3161:1999(E)


Figure 2 — Length of engagement

6.2

Position of tolerances

6.2.1

General

The tolerances are positive (+) for the internal threads and negative (–) for the external threads (that is, the tolerances are applied in the direction of minimum material). 6.2.2

Internal thread

See Figure 3.

a

Basic UNJ profile

Figure 3 — Internal thread tolerances

ISO 3161:1999(E)

6.2.3

External thread

See Figure 4.

I S B ) c ( , y p o C d e l l o r t n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 3a Basic UNJ profile 3 : 1b d is the external thread profile minor diameter. 3 1 : 3 1 Figure 4 — External thread tolerances 5 0 r a6.3 Values of tolerances for profile dimensions and tolerances of the profile form M n o6.3.1 General M , aValues indicated in Tables 4, 5 and 6 have been calculated according to the formulae given in 6.3.2 and are based n , on the length of engagement equal to that shown in 6.1, r e s Uwhere B U  is the basic half-angle at the base of the thread side, i.e. 30°; A : y  is the maximum permissible variation of the half-angle; p o C is the internal thread basic major diameter tolerance; T D d e s T is the internal thread basic minor diameter tolerance; D1 n e c i and T d 2 are the basic pitch diameter tolerances; T D2 L T d

is the external thread basic major diameter tolerance;

T d 1

is the external thread basic minor diameter tolerance;

T d 3

is the external thread profile minor diameter tolerance;

P

is the maximum permissible pitch variation of external or internal threads;

ISO 3161:1999(E)


 D2

is the pitch diameter increment due to lead variation for the internal threads;

 D'2

is the pitch diameter increment due to variations in the half-angles for the internal threads;

d 2

is the pitch diameter increment due to lead variation for the external threads;

d '2

is the pitch diameter increment due to variations in the half-angles for the external threads.

6.3.2

Calculation formulae

Limits of size for untabulated (UNJS) threads shall also be calculated using the formulae given in 6.3.2.1 and 6.3.2.2. 6.3.2.1

External threads

The formulae are as follows: d max. d min.

= d

= d max. – tolerance 0,060

0,060 d 2 max.

3

P

2

3

P

2

: see Table 7, column 3.

= d 2 = d max.  value 0,649 519P

0,649 519P: see Table 7, column 4. d 2 min. T d 2

= d 2 max.  T d 2

= 0,750 F 0,0015 3 d

H

d 3 max.



0,0015

Le



3

0,015

P

2 I

K (listed in Table 8)

= d 3 = d 2 max.  value 0,505 18P

0,505 18P: see Table 7, column 5. d 3 min.

= d 2 min.  value 0,565 80P

0,565 80P: see Table 7, column 6. R max.

= 0,180 42P (listed in Table 7, column 7)

0,180 42P: see Table 7, column 7. R min.

= 0,150 11P (listed in Table 7, column 8)

0,150 11P: see Table 7, column 8. P



d2

cot 

tan  



d2

1,7321

d 2 

1,5 P





0,4T d 2 1,7321

0,4T d 2 2 1,5P

2 The calculation formulae for the tangent of the variations of the half-angle of the thread pitch are approximations of the

maximum effects when the two half-angles are equal.

ISO 3161:1999(E)

6.3.2.2

Internal threads

The formulae are as follows: D max.

= D2 max. + value 0,793 86P

I 0,793 86P: see Table 7, column 9. S B ) D min. = D c ( , y D2 max. = D2 min. + T p D2 o C 3 d = 0,975 F 0,0015 3 d  0,0015 Le  0,015 P 2 I (listed in Table 9) T e D2 l H K l o r t n D2 min. = D min.  value 0,649 519P o c n 0,649 519P: see Table 7, column 4. U , 7 0 D1 max. = D1 min. + T D1 0 2 0 3 0 : for threads with more than 12 threads per inch = F 0, 05 P 2  0, 03 P d I –0,002 (listed in Table 10) T D 1 0 H K 0 + T T for threads with 12 threads per inch or less = 0,120P (listed in Table 10) D1 M G 3 D1 min. = D min.  value 0,974 28P 3 : 1 1 : 0,974 28P: see Table 7, column 10. 3 1 5 0,4T D2 D2 D2 0 P r cot  1,732 1 1,732 1 a M  D2 0,4T  n D2 3 tan    o 1,5 1,5 P P M , a nNOTE On completion of the calculations, round off to four decimal points, except values in Table 6 which shall be rounded , to five decimal points. Round up if the fifth, or sixth decimal, as applicable, is W 5. Keep the fourth, or fifth decimal, as r e s applicable, if the next one is  5. U B U6.3.3 Root radius of the thread A : y 6.3.3.1 Internal threads p o C dFor internal threads, the profile of the actual root of the thread shall at no point be below the basic profile given in eFigure 3. No particular radius is specified. s n e c i L 





3 The calculation formulae for the tangent of the variations of the half-angle of the thread pitch are approximations of the

maximum effects when the two half-angles are equal.

ISO 3161:1999(E)

6.3.3.2


External threads

For external threads, the profile of the actual root of the thread shall lie within the tolerance zone shown in Figure 5. The limit values of the root radius R are specified in Table 4. The profile shall be a continuous blended curve, no part of which shall have a radius of less than 0,150 11P and which is tangential to the thread flanks at not less than 0,562 5 H thread depth. The profile may comprise tangent flank radii that are only joined by a tangential flat at the root.

a

Lower limit profile

b

Upper limit profile

c

Basic UNJ profile

Figure 5 — Radius at the root of the screw thread

6.4

Provisions for coated threads

Before coating, the dimensions of the threads shall be compatible with the thickness of the coating selected and with the limit dimensions for finished parts specified in Tables 5 and 6.

7

Gauging

See ISO 15872. The radius of the thread root shall be checked by an appropriate method. In case of dispute, optical method shall be used as a referee method.

8 8.1

Designation of threads General

Threads shall be designated as shown in 8.2, 8.3, 8.4 and 8.5 by indicating, in sequence, the nominal size in inch decimals, the number of threads per inch, the thread series symbol, the tolerance class4, the thread type (A external or B internal) and, if necessary, symbol LH put at the designation end for left-hand threads, followed by reference to this International Standard.

4 For this International Standard, there is only one tolerance class: 3.

ISO 3161:1999(E)

8.2

Thread symbols with increasing (progressive) pitches Thread series symbol

Coarse pitch series

UNJC

I Fine pitch series UNJF S B ) Extra fine pitch series UNJEF c ( , y EXAMPLE A class 3 thread of the fine pitch series (UNJF), of basic major diameter 0,250 0 in, 28 threads per inch, is p odesignated as follows: C d 0,250 0 - 28UNJF - 3A External threads e l l o r t 0,250 0 - 28UNJF - 3B Internal threads n o c n8.3 Thread symbols with constant (uniform) pitches U , 7The thread series symbol of the constant pitch series is designated by the three letters UNJ. 0 0 2 0EXAMPLE 1 A class 3 thread of the constant pitch series (UNJ), of basic major diameter 3,500 in, 12 threads per inch, is 0 : designated as follows: 0 0 + 3,500 0 - 12UNJ - 3A External threads T M 3,500 0 - 12UNJ - 3B Internal threads G 3 3 : A class 3 left-hand thread (LH) of the constant pitch series (UNJ), of basic major diameter 3,500 in, 12 threads 1EXAMPLE 2 1 : per inch, is designated as follows: 3 1 3,500 0 - 12UNJ - 3A - LH External threads 5 0 r 3,500 0 - 12UNJ - 3B - LH Internal threads a M n8.4 Special threads o M , aThreads derived using the formulae in 6.3.2 and not specified in this International Standard are designated with nseries symbol UNJS and their designation is always followed with limit dimensions. , r e s EXAMPLE 1 0,250 0 - 24UNJS - 3A U MAJOR DIA 0,250 0 - 0,242 8 B U A PITCH DIA 0,222 9 - 0,220 1 : y p MINOR DIA 0,201 9 - 0,196 5 o C ROOT RAD 0,007 5 - 0,006 3 d e s ISO 3161 n e c i 0,437 5 - 24UNJS - 3B LEXAMPLE 2 MINOR DIA 0,396 9 - 0,403 8 PITCH DIA 0,410 4 - 0,414 1 MAJOR DIA 0,437 5 - 0,447 2 ISO 3161

ISO 3161:1999(E)

8.5


Designation of threads having modified crests

Occasionally it is necessary to modify the major diameter of external threads or the minor diameter of internal threads in order to fit a specific purpose, but without changing the pitch diameter limits (it should be noted that existing gauges may be used to accept such threads). Such threads shall be specified with the established thread designation followed by the modified crest diameter limits and the designation "MOD". EXAMPLE 1

0,375 0 - 24UNJF - 3A MOD MAJOR DIA 0,372 0 - 0,364 8 MOD ISO 3161

EXAMPLE 2

0,500 0 - 20UNJF - 3B MOD MINOR DIA 0,454 3 - 0,462 1 MOD ISO 3161

9

Tables

Tables are provided which specify inch dimensions and thread designations in inch units. The conversion procedure for obtaining metric values is to multiply the inch values by 25,4. The resultant values shall be rounded to be within the inch product limits. Table 1 gives the dimensions of basic profile. Table 2 specifies the basic dimensions. Table 3 gives the preferred selection of diameter and number of threads per inch combinations. It is recommended that usage be restricted to the primary sizes indicated. Table 4 gives the limit values of the root radius. Table 5 specifies the values of tolerances for profile dimensions. Table 6 specifies the maximum permissible deviations on half flank angle and pitch (lead). Table 7 gives the basic profile values required for calculating special threads. Table 8 gives the values of pitch diameter tolerances for external threads of special diameter and number of threads per inch combinations. Table 9 gives the values of pitch diameter tolerances for internal threads of special diameter and number of threads per inch combinations. Table 10 gives the values of minor diameter tolerances for internal threads of special diameter and number of threads per inch combinations.

ISO 3161:1999(E)


ISO 3161:1999(E)

Table 2 — Basic dimensions (1)


(2)

(3)

Nominal Number of Major size threads diameter per inch

(4)

(5)

(1)

Pitch diameter

Minor diameter

Nominal Number of Major size threads diameter per inch n

24 20 18 16

n

D, d

D2, d 2

D1, d 1

0,060 0

80

0,060 0

0,051 9

0,047 9

0,073 0

72

0,073 0

0,064 0

0,059 5

0,06+2 9

0,057 8

0,075 9 0,074 4

0,070 8 0,068 6

64 0,086 0

64 56

0,086 0

0,099 0

56 48

0,099 0

0,087 4 0,085 5

0,081 6 0,078 7

0,112 0

48 40

0,112 0

0,098 5 0,095 8

0,091 7 0,087 7

0,125 0

44 40

0,125 0

0,110 2 0,108 8

0,102 9 0,100 7

0,138 0

40 32

0,138 0

0,121 8 0,117 7

0,113 7 0,107 6

0,164 0

36 32

0,164 0

0,146 0 0,143 7

0,137 0 0,133 6

32

0,190 0

0,169 7

0,159 6

0,162 9

0,149 4

0,195 7 0,192 8 0,188 9

0,185 6 0,181 2 0,175 4

0,229 7 0,226 8

0,219 6 0,215 2

0,217 5

0,201 3

0,292 2

0,282 1

0,285 4 0,280 0 0,276 4

0,271 9 0,263 8 0,258 4

0,354 7 0,347 9 0,342 5 0,334 4

0,344 0,334 0,326 0,314

0,414 3

0,402 7

0,405 0 0,396 9 0,391 1

0,388 8 0,376 7 0,368 0

0,476 8 0,467 5

0,465 2 0,451 3

0,459 4 0,450 0

0,439 2 0,425 1

0,190 0

24 0,216 0

0,250 0

32 28 24

0,216 0

32 28

0,250 0

20 0,312 5

32

0,312 5

24 20 18 0,375 0

0,437 5

32 24 20 16

0,375 0

28

0,437 5

20 16 14 0,500 0

28 20 16 13

0,500 0

6 4 3 2

0,562 5

(2)

(3)

(4)

(5)

Pitch diameter

Minor diameter

D, d

D2, d 2

D1, d 1

0,562 5

0,535 4 0,530 0 0,526 4 0,521 9

0,521 0,513 0,508 0,501

0,508 4

0,481 4

12

9 8 4 7

0,625 0

24 20 18 16 12 11

0,625 0

0,597 9 0,592 5 0,588 9 0,584 4 0,570 9 0,566 0

0,584 0,576 0,570 0,564 0,543 0,536

0,687 5

24 20 16

0,687 5

0,660 4 0,655 0 0,646 9

0,646 9 0,638 8 0,626 7

0,633 4

0,606 4

0,717 5 0,709 4 0,695 9

0,701 3 0,689 2 0,668 9

0,685 0

0,652 6

0,780 0

0,763 8

0,771 9 0,758 4

0,751 7 0,731 4

0,842 5

0,826 3

0,834 0,828 0,820 0,802

0,814 0,805 0,793 0,766

12 0,750 0

20 16 12

0,750 0

10 0,812 5

20

0,812 5

16 12 0,875 0

20

0,875 0

16 14 12 9 0,937 5

20

0,937 5

16 12 1,000 0

20 16 12

1,000 0

8 1,062 5

20 18 16 12 8

1,062 5

4 6 9 8

4 3 9 2 9 5

2 5 9 8

0,905 0

0,888 8

0,896 9 0,883 4

0,876 7 0,856 4

0,967 5 0,959 4 0,945 9

0,951 3 0,939 2 0,918 9

0,918 8

0,878 3

1,030 0 1,026 4

1,013 8 1,008 4

1,021 9 1,008 4 0,981 3

1,001 7 0,981 4 0,940 8

ISO 3161:1999(E)

Table 2 (continued ) (1)


(2)

(3)


1,125 0

20

1,092 5

1,076 3

1,088 9 1,084 4

1,070 9 1,064 2

1,070 9 1,043 8 1,032 2

1,043 9 1,003 3 0,985 9

1,155 0 1,151 4 1,146 9 1,133 4

1,138 1,133 1,126 1,106

1,106 3

1,065 8

1,217 5 1,213 9 1,209 4

1,201 3 1,195 9 1,189 2

1,195 9 1,168 8 1,157 2

1,168 9 1,128 3 1,110 9

1,280 0 1,276 4 1,271 9

1,263 8 1,258 4 1,251 7

1,258 4 1,231 3

1,231 4 1,190 8

1,342 5

1,326 3

1,338 1,334 1,320 1,293

1,320 1,314 1,293 1,253

20 18 16 12

1,187 5

20 18 16

1,250 0

20 18 16

1,312 5

20

1,375 0

20 18 16 12

1,437 5

8 20 18 16 12 8

1,500 0

6 1,562 5

n

1,125 0

6

1,500 0


20

18 16 12 8 1,437 5

Minor diameter D1, d 1

12 8 1,375 0

Pitch diameter D2, d 2

12 8 7 1,312 5

(1)

D, d

8 1,250 0

(5)

n

18 16 12 8 7 1,187 5

(4)

20 18 16 12 8

1,562 5

9 4 9 8

1,625 0

(4)

(5)

Pitch diameter

Minor diameter

D, d

D2, d 2

D1, d 1

1,625 0

1,592 5

1,576 3

1,588 9 1,584 4

1,570 9 1,564 2

1,570 9 1,543 8

1,543 9 1,503 3

1,687 5

20 18 16 12 8

1,687 5

1,655 0 1,651 4 1,646 9 1,633 4 1,606 3

1,638 1,633 1,626 1,606 1,565

1,750 0

20

1,750 0

1,717 5

1,701 3

16 12 8

1,709 4 1,695 9 1,668 8

1,689 2 1,668 9 1,628 3

5

1,620 1

1,555 2

8 4 7 4 8

1,812 5

20 16 12 8

1,812 5

1,780 0 1,771 9 1,758 4 1,731 3

1,763 1,751 1,731 1,690

1,875 0

20 16

1,875 0

1,842 5 1,834 4

1,826 3 1,814 2

1,820 9 1,793 8

1,793 9 1,753 3

1,905 0 1,896 9 1,883 4

1,888 8 1,876 7 1,856 4

1,856 3

1,815 8

1,967 5 1,959 4

1,951 3 1,939 2

1,945 9 1,918 8 1,855 7

1,918 9 1,878 3 1,783 5

2,092 5 2,084 4

2,076 3 2,064 2

2,070 9 2,043 8

2,043 9 2,003 3

2,217 5 2,209 4 2,195 9

2,201 3 2,189 2 2,168 9

2,168 8 2,105 7

2,128 3 2,033 5

2,342 5 2,334 4 2,320 9

2,326 3 2,314 2 2,293 9

2,293 8

2,253 3

12 8

9 2 9 3

1,937 5

1,266 7

1,212 7

2,000 0

1,405 0 1,401 4 1,396 9 1,383 4

1,388 1,383 1,376 1,356

1,356 3

1,315 8

1,467 5 1,463 9 1,459 4 1,445 9 1,418 8

1,451 1,445 1,439 1,418 1,378

1,391 7

1,337 7

1,530 0 1,526 4 1,521 9 1,508 4 1,481 3

1,513 1,508 1,501 1,481 1,440

20 16 12

1,937 5

8

8 4 7 4

8 4 7 4 8

(3)

18 16 12 8

8 4 7 4

3 9 2 9 3

(2)

20 16

2,000 0

12 8 4,5 2,125 0

20 16

2,125 0

12 8 2,250 0

20 16 12

2,250 0

8 4,5 2,375 0

20 16 12 8

2,375 0

8 7 4 8

ISO 3161:1999(E)



(2)

(3)


2,500 0

2,750 0

Pitch diameter

Minor diameter

Nominal Number of Major size threads diameter per inch n

16

D2, d 2

D1, d 1

20

2,500 0

2,467 5

2,451 3

2,459 4 2,445 9

2,439 2 2,418 9

2,418 8 2,337 6

2,378 3 2,256 5

2,592 5 2,584 4 2,570 9 2,543 8

2,576 2,564 2,543 2,503

2,717 5 2,709 4

20 16 12 8

2,625 0

20 16

2,750 0

20

2,875 0

16 12 8 3,000 0

(1)

D, d

12 8 4 2,875 0

(5)

n

16 12 8 4 2,625 0

(4)

20 16 12

3,000 0

8 4

3 2 9 3

16 12

3,959 4 3,945 9

3,939 2 3,918 9

3,918 8 3,837 6

3,878 3 3,756 5

4,000 0

8 4

16

4,375 0

4,334 4

4,314 2

4,320 9

4,293 9

2,842 5

2,826 3

2,834 4 2,820 9 2,793 8

2,814 2 2,793 9 2,753 3

2,967 5 2,959 4 2,945 9

12 4,500 0

16 12

4,500 0

4,459 4 4,445 9

4,439 2 4,418 9

4,625 0

16 12

4,625 0

4,584 4 4,570 9

4,564 2 4,543 9

4,750 0

4,750 0

2,951 3 2,939 2 2,918 9

16 12

4,709 4 4,695 9

4,689 2 4,668 9

4,875 0

16 12

4,875 0

4,834 4 4,820 9

4,814 2 4,793 9

2,918 8 2,837 6

2,878 3 2,756 5

5,000 0

16

5,000 0

4,959 4

4,939 2

4,945 9

4,918 9

5,125 0

16 12

5,125 0

5,084 4 5,070 9

5,064 2 5,043 9

5,250 0

16 12

5,250 0

5,209 4 5,195 9

5,189 2 5,168 9

5,375 0

16 12

5,375 0

5,334 4 5,320 9

5,314 2 5,293 9

5,500 0

16 12

5,500 0

5,459 4 5,445 9

5,439 2 5,418 9

5,625 0

16 12

5,625 0

5,584 4 5,570 9

5,564 2 5,543 9

5,750 0

16

5,750 0

5,709 4

5,689 2

5,695 9

5,668 9

3,320 9 3,293 8

3,293 9 3,253 3

3,459 4

3,439 2

12 8

3,445 9 3,418 8

3,418 9 3,378 3

4

3,337 6

3,256 5

3,584 4 3,570 9 3,543 8

3,564 2 3,543 9 3,503 3

3,709 4

3,689 2

3,695 9 3,668 8 3,587 6

3,668 9 3,628 3 3,506 5

12 8 4

4,000 0

4,375 0

3,314 2

3,750 0

3,793 9 3,753 3

2,668 9 2,628 3 2,506 5

3,334 4

16

3,820 9 3,793 8

12 8

2,695 9 2,668 8 2,587 6

3,006 5

3,750 0

3,814 2

4,189 2 4,168 9

3,087 6

3,625 0

3,834 4

4,209 4 4,195 9

3,189 2 3,168 9 3,128 3

16 12 8

3,875 0

4,250 0

3,209 4 3,195 9 3,168 8

3,625 0

D1, d 1

16 12

3,250 0

3,500 0

D2, d 2

4,250 0

16 12 8

16

D, d

2,701 3 2,689 2

3,250 0

3,500 0

Minor diameter

4,064 2 4,043 9

3,064 2 3,043 9 3,003 3

12 8

Pitch diameter

4,084 4 4,070 9

3,084 4 3,070 9 3,043 8

3,375 0

(5)

4,125 0

3,125 0

16

(4)

16 12

16 12 8

3,375 0

(3)

4,125 0

3,125 0

4

3,875 0

(2)

12

12 5,875 0

16 12

5,875 0

5,834 4 5,820 9

5,814 2 5,793 9

6,000 0

16

6,000 0

5,959 4

5,939 2

5,945 9

5,918 9

12

ISO 3161:1999(E)

Table 3 — Thread series (1)

(2)

(3)

(4)

(6)

Series with increasing (progressive) pitches Primary series

(7)

(8)

(9)

Number of threads per inch

Nominal sizes


(5)

Constant (uniform) pitch series

Secondary Coarse pitch Fine pitch series

Extra fine pitch

UNJC

UNJF

UNJEF

8 UNJ

12 UNJ

16 UNJ

20 UNJ

—

80

—

—

—

—

—

64

72

—

—

—

—

—

56

64

—

—

—

—

—

48

56

—

—

—

—

—

0,112 0

40

48

—

—

—

—

—

0,125 0

40

44

—

—

—

—

—

0,138 0

32

40

—

—

—

—

—

0,164 0

32

36

—

—

—

—

—

0,190 0

24

32

—

—

—

—

—

24

28

32

—

—

—

—

0,250 0

20

28

32

—

—

—

UNJC

0,312 5

18

24

32

—

—

—

20

0,375 0

16

24

32

—

—

UNJC

20

0,437 5

14

20

28

—

—

16

UNJF

0,500 0

13

20

28

—

—

16

UNJF

0,562 5

12

18

24

—

UNJC

16

20

0,625 0

11

18

24

—

12

16

20

—

—

24

—

12

16

20

10

16

20

—

12

UNJF

UNJEF

—

—

20

—

12

16

UNJEF

9

14

20

—

12

16

UNJEF

—

—

20

—

12

16

UNJEF

8

12

20

UNJC

UNJF

16

UNJEF

—

—

18

8

12

16

20

7

12

18

8

UNJF

16

20

—

—

18

8

12

16

20

7

12

18

8

UNJF

16

20

—

—

18

8

12

16

20

6

12

18

8

UNJF

16

20

—

—

18

8

12

16

20

6

12

18

8

UNJF

16

20

—

—

18

8

12

16

20

—

—

18

8

12

16

20

—

—

18

8

12

16

20

5

—

—

8

12

16

20

—

—

—

8

12

16

20

—

—

—

8

12

16

20

—

—

—

8

12

16

20

—

—

8

12

16

20

—

—

8

12

16

20

0,060 0 0,073 0 0,086 0 0,099 0

0,216 0

0,687 5 0,750 0 0,812 5 0,875 0 0,937 5 1,000 0 1,062 5 1,125 0 1,187 5 1,250 0 1,312 5 1,375 0 1,437 5 1,500 0 1,562 5 1,625 0 1,687 5 1,750 0 1,812 5 1,875 0 1,937 5 2,000 0

4,5 2,125 0

—

ISO 3161:1999(E)


(2)

(3)

(4)

(6)

Series with increasing (progressive) pitches Primary series

(8)

(9)

Constant (uniform) pitch series

Secondary Coarse pitch Fine pitch series

Extra fine pitch

UNJC

UNJF

UNJEF

8 UNJ

12 UNJ

16 UNJ

20 UNJ

4,5

—

—

8

12

16

20

—

—

—

8

12

16

20

4

—

—

8

12

16

20

—

—

—

8

12

16

20

4

—

—

8

12

16

20

—

—

—

8

12

16

20

4

—

—

8

12

16

20

—

—

—

8

12

16

—

4

—

—

8

12

16

—

—

—

—

8

12

16

—

4

—

—

8

12

16

—

—

—

—

8

12

16

—

4

—

—

8

12

16

—

—

—

—

8

12

16

—

4

—

—

8

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

—

—

—

—

12

16

—

2,250 0 2,375 0 2,500 0 2,625 0 2,750 0 2,875 0 3,000 0 3,125 0 3,250 0 3,375 0 3,500 0 3,625 0 3,750 0 3,875 0 4,000 0 4,125 0 4,250 0 4,375 0 4,500 0 4,625 0 4,750 0 4,875 0 5,000 0 5,125 0 5,250 0 5,375 0 5,500 0 5,625 0 5,750 0 5,875 0 6,000 0

(7)


Nominal sizes


(5)

ISO 3161:1999(E)

Table 4 — Limit values of the root radius R


(1)

(2)

(3)

(4)


Pitch

Root radius

P

R

max.

min.

80

0,012 500

0,002 3

0,001 9

72

0,013 889

0,002 5

0,002 1

64

0,015 625

0,002 8

0,002 3

56

0,017 857

0,003 2

0,002 7

48

0,020 833

0,003 8

0,003 1

44

0,022 727

0,004 1

0,003 4

40

0,025 000

0,004 5

0,003 8

36

0,027 778

0,005 0

0,004 2

32

0,031 250

0,005 6

0,004 7

28

0,035 714

0,006 4

0,005 4

24

0,041 667

0,007 5

0,006 3

20

0,050 000

0,009 0

0,007 5

18

0,055 556

0,010 0

0,008 3

16

0,062 500

0,011 3

0,009 4

14

0,071 429

0,012 9

0,010 7

13

0,076 923

0,013 9

0,011 5

12

0,083 333

0,015 0

0,012 5

11

0,090 909

0,016 4

0,013 6

10

0,100 000

0,018 0

0,015 0

9

0,111 111

0,020 0

0,016 7

8

0,125 000

0,022 6

0,018 8

7

0,142 857

0,025 8

0,021 4

6

0,166 667

0,030 1

0,025 0

5

0,200 000

0,035 1

0,030 0

4,5

0,222 222

0,040 1

0,033 4

4

0,250 000

0,045 1

0,037 5

ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)

Table 6 — Maximum permissible deviations on pitch (lead) and half flank angle (1)

(2)

(3)

size

(5)

n

symbol

(6)

(7)

(8)

(9)

External thread

Series

Nominal


(4)

0,4T d 2

P

(10)

(11)

Internal thread 0,4T D2



°

'

P



°

'

0,060 0,073 0,073 0,086 0,086

0 0 0 0 0

80 64 72 56 64

UNJF UNJC UNJF UNJC UNJF

0,000 0,000 0,000 0,000 0,000

52 60 56 64 60

0,000 30 0,000 35 0,000 32 0,000 37 0,000 35

1 1 1 1 1

35 28 32 22 28

0,000 68 0,000 76 0,000 76 0,000 84 0,000 80

0,000 39 0,000 44 0,000 44 0,000 48 0,000 46

2 1 2 1 1

5 51 5 48 57

0,099 0,099 0,112 0,112 0,125

0 0 0 0 0

48 56 40 48 40

UNJC UNJF UNJC UNJF UNJC

0,000 0,000 0,000 0,000 0,000

68 64 76 72 76

0,000 39 0,000 37 0,000 44 0,000 42 0,000 44

1 1 1 1 1

15 22 10 19 10

0,000 88 0,000 84 0,000 96 0,000 92 0,001 00

0,000 51 0,000 48 0,000 55 0,000 53 0,000 58

1 1 1 1 1

37 48 28 41 32

0,125 0,138 0,138 0,164 0,164

0 0 0 0 0

44 32 40 32 36

UNJF UNJC UNJF UNJC UNJF

0,000 76 0,000 84 0,000 80 0,000 88 0,000 84

0,000 44 0,000 48 0,000 46 0,000 51 0,000 48

1 1 1 1 1

17 2 13 5 9

0,000 96 0,001 08 0,001 00 0,001 12 0,001 08

0,000 55 0,000 62 0,000 58 0,000 65 0,000 62

1 1 1 1 1

37 19 32 22 29

0,190 0,190 0,216 0,216 0,216

0 0 0 0 0

24 32 24 28 32

UNJC UNJF UNJC UNJF UNJEF

0,001 0,000 0,001 0,000 0,000

00 92 04 96 96

0,000 58 0,000 53 0,000 60 0,000 55 0,000 55

0 1 0 1 1

55 7 57 2 10

0,001 0,001 0,001 0,001 0,001

0,000 0,000 0,000 0,000 0,000

74 67 76 72 72

1 1 1 1 1

10 25 13 20 31

0,250 0,250 0,250 0,312 0,312

0 0 0 5 5

20 28 32 18 20

UNJC UNJF UNJEF UNJC UNJ

0,001 12 0,001 00 0,000 96 0,001 20 0,001 20

0,000 65 0,000 58 0,000 55 0,000 69 0,000 69

0 1 1 0 0

51 4 10 50 55

0,001 44 0,001 28 0,001 24 0,001 56 0,001 56

0,000 83 0,000 74 0,000 72 0,000 90 0,000 90

1 1 1 1 1

6 22 31 4 11

0,312 0,312 0,375 0,375 0,375

5 5 0 0 0

24 32 16 20 24

UNJF UNJEF UNJC UNJ UNJF

0,001 08 0,000 96 0,001 32 0,001 24 0,001 16

0,000 62 0,000 55 0,000 76 0,000 72 0,000 67

0 1 0 0 1

59 10 48 57 4

0,001 44 0,001 24 0,001 72 0,001 60 0,001 48

0,000 83 0,000 72 0,000 99 0,000 92 0,000 85

1 1 1 1 1

19 31 3 13 21

0,375 0,437 0,437 0,437 0,437

0 5 5 5 5

32 14 16 20 28

UNJEF UNJC UNJ UNJF UNJEF

0,001 00 0,001 40 0,001 36 0,001 24 0,001 08

0,000 58 0,000 81 0,000 79 0,000 72 0,000 62

1 0 0 0 1

13 45 50 57 9

0,001 32 0,001 84 0,001 80 0,001 64 0,001 40

0,000 76 0,001 06 0,001 04 0,000 95 0,000 81

1 0 1 1 1

37 59 6 15 30

0,500 0,500 0,500 0,500 0,562

0 0 0 0 5

13 16 20 28 12

UNJC UNJ UNJF UNJEF UNJC

0,001 48 0,001 40 0,001 28 0,001 12 0,001 56

0,000 85 0,000 81 0,000 74 0,000 65 0,000 90

0 0 0 1 0

44 51 59 12 43

0,001 92 0,001 84 0,001 68 0,001 44 0,002 04

0,001 11 0,001 06 0,000 97 0,000 83 0,001 18

0 1 1 1 0

57 7 17 32 56

28 16 32 24 24

ISO 3161:1999(E)


(2)

(3)

size

n

symbol

(5)

(6)

(7)

(8)

External thread

Series

Nominal


(4)

0,4T d 2

P

(9)

(10)

(11)




°

'

P



°

'

0,562 0,562 0,562 0,562 0,625

5 5 5 5 0

16 18 20 24 11

UNJ UNJF UNJ UNJEF UNJC

0,001 40 0,001 36 0,001 28 0,001 16 0,001 64

0,000 81 0,000 79 0,000 74 0,000 67 0,000 95

0 0 0 1 0

51 56 59 4 41

0,001 84 0,001 76 0,001 64 0,001 52 0,002 16

0,001 06 0,001 02 0,000 95 0,000 88 0,001 25

1 1 1 1 0

7 13 15 24 54

0,625 0,625 0,625 0,625 0,625

0 0 0 0 0

12 16 18 20 24

UNJ UNJ UNJF UNJ UNJEF

0,001 64 0,001 44 0,001 40 0,001 28 0,001 20

0,000 95 0,000 83 0,000 81 0,000 74 0,000 69

0 0 0 0 1

45 53 58 59 6

0,002 12 0,001 84 0,001 80 0,001 68 0,001 56

0,001 22 0,001 06 0,001 04 0,000 97 0,000 90

0 1 1 1 1

58 7 14 17 26

0,687 0,687 0,687 0,687 0,750

5 5 5 5 0

12 16 24 20 10

UNJ UNJ UNJEF UNJ UNJC

0,001 64 0,001 44 0,001 20 0,001 28 0,001 76

0,000 95 0,000 83 0,000 69 0,000 74 0,001 02

0 0 1 0 0

45 53 6 59 40

0,002 12 0,001 84 0,001 56 0,001 68 0,002 28

0,001 22 0,001 06 0,000 90 0,000 97 0,001 32

0 1 1 1 0

58 7 26 17 52

0,750 0,750 0,750 0,812 0,812

0 0 0 5 5

12 16 20 12 16

UNJ UNJF UNJEF UNJ UNJ

0,001 64 0,001 52 0,001 32 0,001 64 0,001 44

0,000 95 0,000 88 0,000 76 0,000 95 0,000 83

0 0 1 0 0

45 56 0 45 53

0,002 16 0,001 96 0,001 72 0,002 16 0,001 88

0,001 25 0,001 13 0,000 99 0,001 25 0,001 09

0 1 1 0 1

59 12 19 59 9

0,812 0,875 0,875 0,875 0,875

5 0 0 0 0

20 9 12 14 16

UNJEF UNJC UNJ UNJF UNJ

0,001 32 0,001 88 0,001 64 0,001 64 0,001 44

0,000 76 0,001 09 0,000 95 0,000 95 0,000 83

1 0 0 0 0

0 39 45 53 53

0,001 72 0,002 44 0,002 16 0,002 12 0,001 88

0,000 99 0,001 41 0,001 25 0,001 22 0,001 09

1 0 0 1 1

19 50 59 8 9

0,875 0,937 0,937 0,937 1,000

0 5 5 5 0

20 12 16 20 8

UNJEF UNJ UNJ UNJEF UNJC

0,001 32 0,001 68 0,001 48 0,001 36 0,002 04

0,000 76 0,000 97 0,000 85 0,000 79 0,001 18

1 0 0 1 0

0 46 54 2 37

0,001 72 0,002 20 0,001 96 0,001 76 0,002 64

0,000 99 0,001 27 0,001 13 0,001 02 0,001 52

1 1 1 1 0

19 0 12 21 48

1,000 1,000 1,000 1,062 1,062

0 0 0 5 5

12 16 20 8 12

UNJF UNJ UNJEF UNJ UNJ

0,001 76 0,001 48 0,001 36 0,002 04 0,001 68

0,001 02 0,000 85 0,000 79 0,001 18 0,000 97

0 0 1 0 0

48 54 2 37 46

0,002 28 0,001 96 0,001 76 0,002 68 0,002 20

0,001 32 0,001 13 0,001 02 0,001 55 0,001 27

1 1 1 0 1

3 12 21 49 0

1,062 1,062 1,062 1,125 1,125

5 5 5 0 0

16 18 20 7 8

UNJ UNJEF UNJ UNJC UNJ

0,001 48 0,001 44 0,001 36 0,002 16 0,002 04

0,000 85 0,000 83 0,000 79 0,001 25 0,001 18

0 0 1 0 0

54 59 2 35 37

0,001 96 0,001 84 0,001 76 0,002 84 0,002 68

0,001 13 0,001 06 0,001 02 0,001 64 0,001 55

1 1 1 0 0

12 16 21 46 49

ISO 3161:1999(E)


(2)

(3)

size

n

symbol

(5)

(6)

(7)

(8)

External thread

Series

Nominal


(4)

0,4T d 2

P

(9)

(10)

(11)




°

'

P



°

'

1,125 1,125 1,125 1,125 1,187

0 0 0 0 5

12 16 18 20 8

UNJF UNJ UNJEF UNJ UNJ

0,001 80 0,001 48 0,001 44 0,001 36 0,002 08

0,001 04 0,000 85 0,000 83 0,000 79 0,001 20

0 0 0 1 0

50 54 59 2 38

0,002 36 0,001 96 0,001 84 0,001 76 0,002 72

0,001 36 0,001 13 0,001 06 0,001 02 0,001 57

1 1 1 1 0

5 12 16 21 50

1,187 1,187 1,187 1,187 1,250

5 5 5 5 0

12 16 18 20 7

UNJ UNJ UNJEF UNJ UNJC

0,001 72 0,001 52 0,001 44 0,001 40 0,002 20

0,000 99 0,000 88 0,000 83 0,000 81 0,001 27

0 0 0 1 0

47 56 59 4 35

0,002 24 0,002 00 0,001 88 0,001 80 0,002 88

0,001 29 0,001 15 0,001 09 0,001 04 0,001 66

1 1 1 1 0

2 13 18 22 46

1,250 1,250 1,250 1,250 1,250

0 0 0 0 0

8 12 16 18 20

UNJ UNJF UNJ UNJEF UNJ

0,002 12 0,001 84 0,001 52 0,001 44 0,001 40

0,001 22 0,001 06 0,000 88 0,000 83 0,000 81

0 0 0 0 1

39 51 56 59 4

0,002 76 0,002 40 0,002 00 0,001 88 0,001 80

0,001 59 0,001 39 0,001 15 0,001 09 0,001 04

0 1 1 1 1

51 6 13 18 22

1,312 1,312 1,312 1,312 1,312

5 5 5 5 5

8 12 16 18 20

UNJ UNJ UNJ UNJEF UNJ

0,002 12 0,001 72 0,001 52 0,001 44 0,001 40

0,001 22 0,000 99 0,000 88 0,000 83 0,000 81

0 0 0 0 1

39 47 56 59 4

0,002 76 0,002 24 0,002 00 0,001 88 0,001 80

0,001 59 0,001 29 0,001 15 0,001 09 0,001 04

0 1 1 1 1

51 2 13 18 22

1,375 1,375 1,375 1,375 1,375

0 0 0 0 0

6 8 12 16 18

UNJC UNJ UNJF UNJ UNJEF

0,002 40 0,002 16 0,001 88 0,001 52 0,001 44

0,001 39 0,001 25 0,001 09 0,000 88 0,000 83

0 0 0 0 0

33 40 52 56 59

0,003 12 0,002 80 0,002 44 0,002 00 0,001 88

0,001 80 0,001 62 0,001 41 0,001 15 0,001 09

0 0 1 1 1

43 51 7 13 18

1,375 1,437 1,437 1,437 1,437

0 5 5 5 5

20 8 12 16 18

UNJ UNJ UNJ UNJ UNJEF

0,001 40 0,002 16 0,001 76 0,001 56 0,001 48

0,000 81 0,001 25 0,001 02 0,000 90 0,000 85

1 0 0 0 1

4 40 48 57 1

0,001 80 0,002 84 0,002 28 0,002 04 0,001 92

0,001 04 0,001 64 0,001 32 0,001 18 0,001 11

1 0 1 1 1

22 52 3 15 19

1,437 1,500 1,500 1,500 1,500

5 0 0 0 0

20 6 8 12 16

UNJ UNJC UNJ UNJF UNJ

0,001 44 0,002 44 0,002 20 0,001 88 0,001 56

0,000 83 0,001 41 0,001 27 0,001 09 0,000 90

1 0 0 0 0

6 34 40 52 57

0,001 84 0,003 16 0,002 84 0,002 52 0,002 04

0,001 06 0,001 82 0,001 64 0,001 45 0,001 18

1 0 0 1 1

24 43 52 9 15

1,500 1,500 1,562 1,562 1,562

0 0 5 5 5

18 20 8 12 16

UNJEF UNJ UNJ UNJ UNJ

0,001 48 0,001 44 0,002 20 0,001 76 0,001 56

0,000 85 0,000 83 0,001 27 0,001 02 0,000 90

1 1 0 0 0

1 6 40 48 57

0,001 92 0,001 84 0,002 88 0,002 28 0,002 04

0,001 11 0,001 06 0,001 66 0,001 32 0,001 18

1 1 0 1 1

19 24 53 3 15

ISO 3161:1999(E)


(2)

(3)

size

(5)

n

symbol

(6)

(7)

(8)

(9)

External thread

Series

Nominal


(4)

0,4T d 2

P

(10)

(11)




°

'

P



°

'

1,562 1,562 1,625 1,625 1,625

5 5 0 0 0

18 20 8 12 16


0,001 48 0,001 44 0,002 24 0,001 76 0,001 56

0,000 85 0,000 83 0,001 29 0,001 02 0,000 90

1 1 0 0 0

1 6 41 48 57

0,001 92 0,001 84 0,002 88 0,002 28 0,002 04

0,001 11 0,001 06 0,001 66 0,001 32 0,001 18

1 1 0 1 1

19 24 53 3 15

1,625 1,625 1,687 1,687 1,687

0 0 5 5 5

18 20 8 12 16


0,001 48 0,001 44 0,002 24 0,001 80 0,001 60

0,000 85 0,000 83 0,001 29 0,001 04 0,000 92

1 1 0 0 0

1 6 41 50 59

0,001 92 0,001 84 0,002 92 0,002 32 0,002 08

0,001 11 0,001 06 0,001 69 0,001 34 0,001 20

1 1 0 1 1

19 24 54 4 16

1,687 1,687 1,750 1,750 1,750

5 5 0 0 0

18 20 5 8 12

UNJEF UNJ UNJC UNJ UNJ

0,001 52 0,001 44 0,002 68 0,002 28 0,001 80

0,000 88 0,000 83 0,001 55 0,001 32 0,001 04

1 1 0 0 0

3 6 31 42 50

0,001 96 0,001 88 0,003 48 0,002 96 0,002 32

0,001 13 0,001 09 0,002 01 0,001 71 0,001 34

1 1 0 0 1

21 26 40 54 4

1,750 1,750 1,812 1,812 1,812

0 0 5 5 5

16 20 8 12 16

UNJ UNJ UNJ UNJ UNJ

0,001 0,001 0,002 0,001 0,001

60 44 28 80 60

0,000 0,000 0,001 0,001 0,000

92 83 32 04 92

0 1 0 0 0

59 6 42 50 59

0,002 0,001 0,002 0,002 0,002

08 88 96 32 08

0,001 0,001 0,001 0,001 0,001

20 09 71 34 20

1 1 0 1 1

16 26 54 4 16

1,812 1,875 1,875 1,875 1,875

5 0 0 0 5

20 8 12 16 20

UNJ UNJ UNJ UNJ UNJ

0,001 0,002 0,001 0,001 0,001

44 28 80 60 44

0,000 0,001 0,001 0,000 0,000

83 32 04 92 83

1 0 0 0 1

6 42 50 59 6

0,001 0,003 0,002 0,002 0,001

88 00 32 08 88

0,001 0,001 0,001 0,001 0,001

09 73 34 20 09

1 0 1 1 1

26 55 4 16 26

1,937 1,937 1,937 1,937 2,000

5 5 5 5 0

8 12 16 20 4,5

0,002 32 0,001 80 0,001 60 0,001 48 0,002 84

0,001 34 0,001 04 0,000 92 0,000 85 0,001 64

0 0 0 1 0

43 50 59 8 29

0,003 00 0,002 36 0,002 08 0,001 92 0,003 72

0,001 73 0,001 36 0,001 20 0,001 11 0,002 15

0 1 1 1 0

55 5 16 28 38

2,000 2,000 2,000 2,000 2,125

0 0 0 0 0

8 12 16 20 8

0,002 0,001 0,001 0,001 0,002

0,001 0,001 0,000 0,000 0,001

34 04 92 85 36

0 0 0 1 0

43 50 59 8 43

0,003 0,002 0,002 0,001 0,003

0,001 0,001 0,001 0,001 0,001

76 36 20 11 78

0 1 1 1 0

56 5 16 28 56

2,125 2,125 2,125 2,250 2,250

0 0 0 0 0

12 16 20 4,5 8

0,001 04 0,000 92 0,000 85 0,001 69 0,001 39

0 0 1 0 0

50 59 8 30 44

0,002 36 0,002 08 0,001 92 0,003 80 0,003 12

0,001 36 0,001 20 0,001 11 0,002 19 0,001 80

1 1 1 0 0

5 16 28 39 57

UNJ UNJ UNJ UNJ UNJC UNJ UNJ UNJ UNJ UNJ UNJ UNJ UNJ UNJC UNJ

32 80 60 48 36

0,001 80 0,001 60 0,001 48 0,002 92 0,002 40

04 36 08 92 08

ISO 3161:1999(E)


(2)

(3)

size

(5)

n

symbol

(6)

(7)

(8)

(9)

External thread

Series

Nominal


(4)

0,4T d 2

P

0,4T D2



'

04 92 85 39 06

0 0 1 0 0

50 59 8 44 51

0,002 0,002 0,001 0,003 0,002

0,001 64 0,001 52 0,003 12 0,002 44 0,001 84

0,000 95 0,000 88 0,001 80 0,001 41 0,001 06

1 1 0 0 0

0 10 29 45 51

0,001 0,001 0,002 0,001 0,001

0,000 0,000 0,001 0,001 0,000

95 88 43 06 95

1 1 0 0 1

0,001 52 0,003 16 0,002 52 0,001 84 0,001 64

0,000 88 0,001 82 0,001 45 0,001 06 0,000 95

0,001 0,002 0,001 0,001 0,001

0,000 0,001 0,001 0,000 0,000

80 60 48 40 84

P



°

'

36 20 11 82 39

1 1 1 0 1

5 16 28 58 6

0,002 16 0,002 00 0,004 04 0,003 20 0,002 40

0,001 25 0,001 15 0,002 33 0,001 85 0,001 39

1 1 0 0 1

19 32 37 59 6

0 10 45 51 0

0,002 0,002 0,003 0,002 0,002

0,001 0,001 0,001 0,001 0,001

25 15 85 41 25

1 1 0 1 1

19 32 59 7 19

1 0 0 0 1

10 29 46 51 0

0,002 00 0,004 12 0,003 24 0,002 40 0,002 16

0,001 15 0,002 38 0,001 87 0,001 41 0,001 25

1 0 0 1 1

32 38 59 7 19

88 45 09 97 90

1 0 0 1 1

10 46 52 2 11

0,002 0,003 0,002 0,002 0,002

0,001 0,001 0,001 0,001 0,001

15 89 43 27 18

1 1 1 1 1

32 0 8 21 33

2,250 2,250 2,250 2,375 2,375

0 0 0 0 0

12 16 20 8 12

UNJ UNJ UNJ UNJ UNJ

2,375 2,375 2,500 2,500 2,500

0 0 0 0 0

16 20 4 8 12

UNJ UNJ UNJC UNJ UNJ

2,500 2,500 2,625 2,625 2,625

0 0 0 0 0

16 20 8 12 16

UNJ UNJ UNJ UNJ UNJ

2,625 2,750 2,750 2,750 2,750

0 0 0 0 0

20 4 8 12 16

UNJ UNJC UNJ UNJ UNJ

2,750 2,875 2,875 2,875 2,875

0 0 0 0 0

20 8 12 16 20

UNJ UNJ UNJ UNJ UNJ

3,000 3,000 3,000 3,000 3,000

0 0 0 0 0

4 8 12 16 20

UNJC UNJ UNJ UNJ UNJ

0,003 20 0,002 56 0,001 88 0,001 68 0,001 56

0,001 85 0,001 48 0,001 09 0,000 97 0,000 90

0 0 0 1 1

29 47 52 2 11

0,004 16 0,003 32 0,002 48 0,002 20 0,002 04

0,002 40 0,001 92 0,001 43 0,001 27 0,001 18

0 1 1 1 1

38 1 8 21 33

3,125 3,125 3,125 3,250 3,250

0 0 0 0 0

8 12 16 4 8

UNJ UNJ UNJ UNJC UNJ

0,002 56 0,001 88 0,001 68 0,003 28 0,002 60

0,001 48 0,001 09 0,000 97 0,001 89 0,001 50

0 0 1 0 0

47 52 2 30 48

0,003 36 0,002 48 0,002 20 0,004 24 0,003 40

0,001 94 0,001 43 0,001 27 0,002 45 0,001 96

1 1 1 0 1

2 8 21 39 2

3,250 3,250 3,375 3,375 3,375

0 0 0 0 0

12 16 8 12 16

UNJ UNJ UNJ UNJ UNJ

0,001 0,001 0,002 0,001 0,001

0,001 0,000 0,001 0,001 0,000

0 1 0 0 1

52 2 48 53 3

0,002 0,002 0,003 0,002 0,002

0,001 0,001 0,001 0,001 0,001

1 1 1 1 1

8 21 2 9 22

64 52 48 84 64

52 52 88 68 56

88 68 64 92 72

0,001 0,000 0,000 0,001 0,001

(11)

Internal thread

° 0,001 0,001 0,001 0,002 0,001

(10)

09 97 52 11 99

36 08 92 16 40

16 00 20 40 16

00 28 48 20 04

48 20 40 52 24

0,001 0,001 0,001 0,001 0,001

43 27 96 45 29

ISO 3161:1999(E)


(2)

(3)

size

(5)

n

symbol

(6)

(7)

(8)

(9)

External thread

Series

Nominal


(4)

0,4T d 2

P

(10)

(11)




°

'

P



°

'

3,500 3,500 3,500 3,500 3,625

0 0 0 0 0

4 8 12 16 8

UNJC UNJ UNJ UNJ UNJ

0,003 32 0,002 64 0,001 92 0,001 72 0,002 68

0,001 92 0,001 52 0,001 11 0,000 99 0,001 55

0 0 0 1 0

30 48 53 3 49

0,004 32 0,003 44 0,002 52 0,002 24 0,003 48

0,002 49 0,001 99 0,001 45 0,001 29 0,002 01

0 1 1 1 1

40 3 9 22 4

3,625 3,625 3,750 3,750 3,750

0 0 0 0 0

12 16 4 8 12

UNJ UNJ UNJC UNJ UNJ

0,001 92 0,001 72 0,003 36 0,002 68 0,001 92

0,001 11 0,000 99 0,001 94 0,001 55 0,001 11

0 1 0 0 0

53 3 31 49 53

0,002 52 0,002 24 0,004 36 0,003 52 0,002 52

0,001 45 0,001 29 0,002 52 0,002 03 0,001 45

1 1 0 1 1

9 22 40 5 9

3,750 3,875 3,875 3,875 4,000

0 0 0 0 0

16 8 12 16 4

UNJ UNJ UNJ UNJ UNJC

0,001 72 0,002 72 0,001 96 0,001 76 0,003 40

0,000 99 0,001 57 0,001 13 0,001 02 0,001 96

1 0 0 1 0

3 50 54 5 31

0,002 24 0,003 52 0,002 56 0,002 28 0,004 44

0,001 29 0,002 03 0,001 48 0,001 32 0,002 56

1 1 1 1 0

22 5 10 24 41

4,000 4,000 4,000 4,125 4,125

0 0 0 0 0

8 12 16 12 16

UNJ UNJ UNJ UNJ UNJ

0,002 0,001 0,001 0,001 0,001

72 96 76 96 76

0,001 0,001 0,001 0,001 0,001

57 13 02 13 02

0 0 1 0 1

50 54 5 54 5

0,003 0,002 0,002 0,002 0,002

56 56 28 56 28

0,002 0,001 0,001 0,001 0,001

06 48 32 48 32

1 1 1 1 1

5 10 24 10 24

4,250 4,250 4,375 4,375 4,500

0 0 0 0 0

12 16 12 16 12

UNJ UNJ UNJ UNJ UNJ

0,001 0,001 0,001 0,001 0,001

96 76 96 76 96

0,001 0,001 0,001 0,001 0,001

13 02 13 02 13

0 1 0 1 0

54 5 54 5 54

0,002 0,002 0,002 0,002 0,002

56 28 56 28 56

0,001 0,001 0,001 0,001 0,001

48 32 48 32 48

1 1 1 1 1

10 24 10 24 10

4,500 4,625 4,625 4,750 4,750

0 0 0 0 0

16 12 16 12 16

UNJ UNJ UNJ UNJ UNJ

0,001 0,002 0,001 0,002 0,001

76 00 80 00 80

0,001 0,001 0,001 0,001 0,001

02 15 04 15 04

1 0 1 0 1

5 55 6 55 6

0,002 0,002 0,002 0,002 0,002

28 64 36 64 36

0,001 0,001 0,001 0,001 0,001

32 52 36 52 36

1 1 1 1 1

24 13 27 13 27

4,875 4,875 5,000 5,000 5,125

0 0 0 0 0

12 16 12 16 12

UNJ UNJ UNJ UNJ UNJ

0,002 0,001 0,002 0,001 0,002

00 80 00 80 00

0,001 0,001 0,001 0,001 0,001

15 04 15 04 15

0 1 0 1 0

55 6 55 6 55

0,002 0,002 0,002 0,002 0,002

64 36 64 36 64

0,001 0,001 0,001 0,001 0,001

52 36 52 36 52

1 1 1 1 1

13 27 13 27 13

5,125 5,250 5,250 5,375 5,375

0 0 0 0 0

16 12 16 12 16

UNJ UNJ UNJ UNJ UNJ

0,001 0,002 0,001 0,002 0,001

80 00 80 00 80

0,001 0,001 0,001 0,001 0,001

04 15 04 15 04

1 0 1 0 1

6 55 6 55 6

0,002 0,002 0,002 0,002 0,002

36 64 36 64 36

0,001 0,001 0,001 0,001 0,001

36 52 36 52 36

1 1 1 1 1

27 13 27 13 27

ISO 3161:1999(E)


(2)

(3)

size

(5)

n

symbol

(6)

(7)

(8)

(9)

External thread

Series

Nominal


(4)

0,4T d 2

P

(10)

(11)




°

'

P



°

'

5,500 5,500 5,625 5,625 5,750

0 0 0 0 0

12 16 12 16 12

UNJ UNJ UNJ UNJ UNJ

0,002 0,001 0,002 0,001 0,002

00 80 08 88 08

0,001 0,001 0,001 0,001 0,001

15 04 20 09 20

0 1 0 1 0

55 6 57 9 57

0,002 0,002 0,002 0,002 0,002

64 36 68 44 68

0,001 0,001 0,001 0,001 0,001

52 36 55 41 55

1 1 1 1 1

13 27 14 29 14

5,750 5,875 5,875 6,000 6,000

0 0 0 0 0

16 12 16 12 16

UNJ UNJ UNJ UNJ UNJ

0,001 0,002 0,001 0,002 0,001

88 08 88 08 88

0,001 0,001 0,001 0,001 0,001

09 20 09 20 09

1 0 1 0 1

9 57 9 57 9

0,002 0,002 0,002 0,002 0,002

44 68 44 68 44

0,001 0,001 0,001 0,001 0,001

41 55 41 55 41

1 1 1 1 1

29 14 29 14 29

ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)


ISO 3161:1999(E)



BS A 346-2000 (ISO 3161-1999)

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